(Creative).Version

Description

Version: The version number helps you keep track of multiple versions
of your creative in your reports. The version number will always be
auto-generated during insert operations to start at 1. For tracking
creatives the version cannot be incremented and will always remain at
1. For all other creative types the version can be incremented only
by 1 during update operations. In addition, the version will be
automatically incremented by 1 when undergoing Rich Media creative
merging. Applicable to all creative types.